Motor hoist



June 9, 1925. 1,541,4157

F. H. LNLEY MOTOR HOIST Filed Sept. 27. 1925 PatentedY June 9, y I

UNITED STATES,l

:man H. LINLEYQOF 'DULUTIL MINNESOTA;

Moron HoIsT.

Application led September 27, 1923. Serial No. 665,142.

To all 'whom it may concern:

Be it known that. I, F RED H. LINLEY, a citizen of the United States,residing at Duluth, in the county of St. Louis and State of Minnesota,have invented certain new and useful Improvements in Motor Hoists, yofwhich` the following is a specification.

This invention relates to a new and 1mproved motor hoist and moreparticularly to a hoist of this type driven by a motor both the fieldand armature of which revolve.A

Hoists of this type are particularly adapted for use in undergroundmlmng operations where the hoist isused to drag a scraper of ore forloading,purposes. In such operations the scraper is normally draggedback to the ore pile by hand and the drag cable should run freely duringthis return movement. By having both ,the field and armature revolve andhaving them revolve' in opposite directions, the relative movementbetween the two members is in creased without 'increasing the movementof either relative to the yhoist frame.

It is an object of the present invention to provide a new and improvedhoist driven by a motor having a movable field and movable armature.

It is a further object to provide a holst of this character in which thefield and armature are adapted to be gear connected so as to controltheir relative movement.

It is also an object to provide a hoist vso connected in which the gearconnection is controlled by centrifugal clutch.

It is an additional object to provide a hoist of this character inwhichv the hoisl' drum is carried by one of the moving elements. 1

Other and further objects will appear as the description proceeds.

I have illustrated a preferred embodiment of my invention in theaccompanying drawings, in which Figure 1 is a longitudinaatll sectiontalc on line 1-1 of Figure 2; and Figure 2 is a cross section taken online 2 2 of Figure 1.

The hoist comprises the frame 11 in which the hoist. drumu 12 is carriedupon bearinfv 13 and 14. This drum 12 carries the field windings 15 ofthe motor. The shoulfle 16 of the drum member carries the slip rings 17and 18 to which the motor operating current is fed from wires 19 and2l). This current is transferred through brushes 2l and 22 to thearmature commutator 23..

The armature 24 is carried upon the shat 25 which rests in bearings 26and 27 forme l in the hoist drum member.

end of the shaft 25 carries the gear 2S. This gear 28 meshes with thegear 29 which gear fits loosely on the stub shaft 30. The gear 29carries the centrifugal clutch-mem bers 31 adapted to coact with theclutch disk 32 which latter is directly connected to thel shaft 30. Theopposite end of the shaft 30 carries the small gear 33 which meshes withthe internal gear 34 formed upon the inner face of the hoist drum flange35.

In the operation of the hoist, when it is desired to draw in or wind upthe cable upon the hoist drum, the current is supplied to the motor.ture to revolve relative to the field. The gear 28 causes the gear 29t'o revolve and when the proper speed is reached. the centrifugal clutchmembers 31 grip the clutch `dish 32 thus rotating the small gear 33.This gear 33 meshes with the internal gear 34 formed in the hoist drummember and causes that member carrying the field to rotate in thedirection opposite to the direction of rotation of the armature.

The relative movement, therefore, of the field and armature is made veryhigh without causing the drum carrying the field rotate at an excessivespeed. This -high speed of relative movement permits the hoist The righthand This causes the armato have comparatively high power and yet be ofsmall size.

At the end of the hauling in movement, the current is shut oli and themotor is stopped. When it is desired to haul out the cable to carry thescraper back to the ore pile, the cable is drawn out by dragging awaythe scraper thusA causing the hoistl drum to rotate in the reversedirection. This rotation by means of the gear 34 causes the gear 33 andfriction disk 32 to rotate. However, the clutch members 31 are at thistime disconnected and consequently the armature is not rotated. Thehoist drum itself thus rotates freely and the scraper may be drawn tothe desired position without undue resistance by the hoist motor.

I have illustrated one preferred form of my construction and describedone specific application of itto al particular use. .It is to beunderstood, however, Ithat it is adapted for other uses and Icontemplate such changes and modicationsto adapt it to such uses as maycome Within the scope of the appended claims.

I claim:

l. In a motor hoist, a hoist frame, an armature and a field, both saidmembers being movable relative to the hoist fra-me,

gearing adapted to connect the armature and field to control theirrelative movement, and a speed controlled .clutch adaptedto bring saidgea-ring into operation upon one of said members reaching apredetermined i hoist drum carried by said field, both said field andarmature being rotatable relative to each other and to the hoist frame,gears carried by the armature and hoist drum, and further gearing and acentrifugal clutch adapted to operatively connect the armature and hoistdrums.

1. In a motor hoist, a hoist frame, a field and an armature carried bysaid frame, a hoist drum carried by said field, both said field andamature being rotatable relative to each' other and to the hoist frame,gears carried` 4by the armature and hoist drum,

Ynormally in its inoperative position.

5. In .a motor hoist, a hoist frame, a field and an armature carried bysaid frame, a hoist drum carriedvby saidy field, both said field andarmature being rotatable relative to each other and to the hoist-frame,gears carried by the armature and hoist drum, and further gearing .and acentrifugal clutch adapted to operatively connect the armature andhoistl drums, the movable clutch members being driven by the armaturegear. y

6. In a moto-r hoist, a hoist frame, a field and an armature carried bysaid frame, a hoist drum carried by said field, both said field andarmature being rotatable relative to each other and to the hoist frame,gears carried by the armature and hoist drum, and further gearing and acentrifugal clutch adapted to operatively connect the armature and hoistdrum, the movable clutch members being driven by the armature gear, theclutch being .normally in its inoperative position.

Signed at Duluth, Minnesota, this 17th day of September, 1923.

FRED H. LINLEY

